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Content update - Preview events (user story 1878475) (#1332)

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* Add article, toc, and redirects

* Add a prerequisites section to 3 other event articles

* Further edits

* Update dotnet-desktop-guide/net/wpf/toc.yml

Co-authored-by: Andy (Steve) De George <[email protected]>

* Update article links

* Minor clarification

Co-authored-by: Andy (Steve) De George <[email protected]>
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2022-03-14 15:26:19 -07:00
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dotnet-desktop-guide/net/wpf/events/visual-basic-and-wpf-event-handling.md
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@@ -14,6 +14,10 @@ If you're coding in Visual Basic .NET, you can use the language-specific [Handle
[!INCLUDE [desktop guide under construction](../../includes/desktop-guide-preview-note.md)]
## Prerequisites
The article assumes a basic knowledge of routed events, and that you've read [Routed events overview](/dotnet/desktop/wpf/advanced/routed-events-overview?view=netframeworkdesktop-4.8&preserve-view=true). To follow the examples in this article, it helps if you're familiar with Extensible Application Markup Language (XAML) and know how to write Windows Presentation Foundation (WPF) applications.
## Syntax
The syntax for a `Sub` declaration that uses the [Handles](/dotnet/visual-basic/language-reference/statements/handles-clause) keyword is: `Sub <procedure name> Handles <object name>.<event name>`. That syntax designates a procedure as the event handler that will run when an event specified by `<event name>` is raised on an object specified by `<object name>`. The event must be a member of the object's class or base class. The following example shows how to attach an event handler to a XAML element using `Handles`.